The numbers seems quite off, for example, according to this article: http://www.motortrend.com/news/1967-pontiac-gto-drive/ a 1967 Pontiac GTO was $3764.19 when new, which give us an idea on how much a muscle car should cost, a rough estimated of $3,500-3,900, give or take.
Now, the cars submitted so far costs in average around 15,000 automation money units (or automaleons as I call’em). Using the calculator you propose, it gives a price of $2,235.77 for 1969 considering the automation moneys as 2010 money, and $2,047.28 as 2016 money. Which is way off. (why 2010? because I read in the forum that the automation money units are from 2010).
Now, with the Gold method, with 15,000 automation money units we will get a price of $3,546.08, which is closer to a real price in that year. I got the idea from another thread where killrob discussed the difference between money and currency, and he proposed the gold method actually.